Furnace door frame



May 8, 1951 o. 1.. BRAUN FURNACE DOOR FRAME Filed April 29. 1947 Illlllllllllllllll INVENTOR- OTTwnv L. BRA UN BY HTTORNEYS cooling water.

Patented May 8,- 1951 FURNACE DOOR FRAME Ottwin L. Braun, Pittsburgh, Pa., assignor to Reliance Steel Products Company, McKeesport, Pa., a corporation of Pennsylvania Application April 29, 1947, Serial No. 744,728

'7 Claims. 1

This invention relates in general to furnace door frames and more particularly to a watercooled furnace door frame and skewback channel cooler for use in open hearth furnaces and the like.

It is common in the art to provide a horizontally projecting lintel or nose portion which extends from a convenient position on the back of the door frame into the furnace chamber. The purpose of the lintel is to cool and protect from furnace heat the skew-back channel which is located just above the door frame when the frame is in position. in the furnace wall. A furnace using this type of door frame is referred to as archless, as it is unnecessary to provide a protecting refractory arch over the doorway and under the skew-back channel.

One of the difficulties encountered in the use of door frames and skew-back coolers as heretofore constructed is the tendency of the skewback cooler or lintel to burn out. This is largely due to deposits which accumulate and lodge in the lintel because of the slowness of the water circulation therethrough. The slowness is due to the relatively large cross section of the cooler as compared to the cross section of the water supply pipe. I greatly increase the velocity of flow of the water without increasing the volume of the cooling water as passed through the cooler by dividing the cooler into relatively narrow longitudinal passages and arranging the water supply pipes so that the cooling water issupplied directly to each of the passages from its own supply line. The water is led from the discharge end of the passages to the hollow legs of the frame and flows up through the legs, through the main portion of the frame, and thence to an outlet.

The higher velocity of the cooling water through the passages greatly diminishes any tendency for depositionon the passage Walls of material frequently carried in suspension in the Moreover the higher velocity of the water tends to better conduct the heat away from the lintel walls, lessens scale deposits, and

, prolongs the life of the cooler.

for increasing the velocity of flow of Water through critical areas of the frame, to prevent sedimentation and formation of scale deposits in these areas.

In the accompanying drawings which illustrate the present preferred embodiment of my invention:

Figure 1 is a front elevation of the frame;

Figure 2 is a horizontal section of the frame along the line II-II of Figure 1; and Figure 3 is a vertical section of the frame along the line III-III'of Figure l.

In the drawings there is shown a-portion ID of a furnace roof and a skew-back II, which is supported by a metal skew-back channel l2, adjacent the door frame.

The door frame has a hollow body portion '|3 which forms the top of the frame and two hollow legs I 4 and I5 which extend downwardly from each end of the body portion. The structure generally resembles an inverted U. Projecting inwardly into the furnace chamber from a position adjacent the lower part of the rear wall It of the body portion H1 is a horizontally extending hollow offset or lintel I! which acts as a cooler and heat buffer for the skew-back channel I2. The lower edge of the body portion and the legs together define a U-shaped door opening.

The lintel l1 consists of a top plate 3, a nose l9, and a bottom plate 20 which slants slightly downwardly from the bottom of the nose to the back plate l6. These plates form a water-tight box, the inner edges of which are welded to the back plate It. The lintel is divided into two passages, an outer passage 2| and an inner passage 22 and a compartment 23, of approximately equal width, by two partitions or bafiles 24 and 25 welded to the inside of the lintel shell and at the ends to the back plate It. The two partitions or bafiles 24 and 25 are of inverted Li-shape as seen edgewise in Fig. 2. The back plate It is cut away so that there is an opening 26 between the compartment 23 and the hollow body portion or water space I3. This permits cooling water to freely circulate between the body portion I3 and compartment 23. V

The lintel passage 2| is provided at the left end (as viewed in Figure 1) with a water inlet 21 which leads through the back plate l6 and is connected to a water supply inlet 28 by a pipe 29. The inlet 21 opens into the lower left corner of the passage 2| so that the water is directed along the bottom of the passage to minimize the deposition of silt that may be carried in the cooling water. The right end of the passage 2| is connected at the lower left'corner through an opening in back plate It to a pipe 30 which extends to a position near the bottom of leg I5. The water from supply inlet 28 flows through pipe 29,

3 through inlet 21 into the left end of passage 2|, through passage 2 I, through pipe 30 to the bottom of leg 45, up the leg l through body portion l3, thence to a main outlet 3!.

The lower right-hand corner of the righthand end of passage '22 (as viewed in Fig. 2) is connected through the back plate l6 by the pipe 32 to a water supply inlet 33. The left end of passage 22 discharges through an opening in back plate I6, through pipe 34, which extends through back plate IE to a position adjacent the bottom of leg I l. Cooling water from supply inlet 33 passes through pipe 32 to the righthand end of passage 22, through the passage 22 to the pipe 34, through pipe 34 to the bottom of leg 14, upwardly through the leg I l, through the body portion l3, and is discharged through the outlet 3|.

The compartment 23 is cooled by water from the body portion l3 which passes through the opening 26. To prevent accumulation of steam in passages 2! or 22, I provide small vent holes 35 and 36 through back plate I6, one in each end of the passage 2 l, at the top of the passage. Similar vent holes 31 and 38 are provided in the ends of passage 22.

The lintel, and especially the nose portion thereof, is exposed to the highest temperature of any portion of the frame. In my invention the cooling water first passes through the lintel passages, then through the legs, and finally through the body portion to the outlet. The relatively narrow water passages in the lintel cause the cooling water to rapidly pass along the metalconfining surfaces and scour the heat away. This stood the invention may be otherwise embodied within the scope of the following claims.

I claim:

1. A hollow water-cooled frame for a furnace doorway and skew-back channel comprising a water-containing hollow body portion forming the top of the frame, two hollow legs internally communicating with said body portion and depending therefrom in laterally spaced relation to form the sides of the frame, a hollow lintel integral with and horizontally oflset from said body portion adjacent the bottom thereof for projection into the furnace doorway immediately below the skew-back channel, means for dividing the interior of said lintel into two passages extending in side by-side contact lengthwise of the lintel, an inlet for each passage arranged to deliver to one end thereof a stream of cooling water, and an outlet duct for each passage arranged to receive the stream of cooling water from the other end of the passage, whereby two parallel independently supplied streams of cooling water are cause to flow severally in said passages from end to end.

2. The structure of the next-preceding claim, said hollow lintel including with said two passages a compartment standing in wide-open communication with the interior of said hollow body.

3. A hollow water-cooled frame for a furnace doorway and skew-back channel comprising a water-containing hollow body portion forming the top of the frame, two hollow legs internally communicating with said body portion and depending therefrom in laterally spaced relation to form the sides of the frame, a hollow lintel integral with and horizontally offset from said body portion adjacent the bottom thereof for projection into the furnace doorway immediately below the skew-back channel, means for dividing the interior of said lintel into two passages extending in side-by-side contact lengthwise of the lintel, an inlet for each passage arranged to deliver to one end thereof a stream of cooling water, and an outlet duct for each passage arranged to receive the stream of cooling water from the other end of the passage, whereby two parallel independently supplied streams of cooling water are caused to flow severally in said passages from end to end, said outlet ducts being arranged to deliver their streams of water one to the bottom of each of said hollow legs, and a main water outlet duct opening from said hollow body.

4. A hollow water-cooled frame for a furnace doorway and skew-back channel comprising a water-containing hollow body portion forming the top of the frame, two hollow legs internally communicating with said body portion and depending therefrom in laterally spaced relation to form the sides of the frame, a hollow lintel integral with and horizontally ofiset from said body portion adjacent the bottom thereof for projection into the furnace doorway immediately below the skew-back channel, a partition of inverted U-shape as seen edgewise dividing the interior of said lintel into two passages extending in sideby-side contact lengthwise of the lintel, an inlet for each passage arranged to deliver to one end thereof a stream of cooling water, and an outlet duct for each passage arranged to receive the stream of cooling water from the other end of the passage, whereby two parallel independently supplied streams of cooling water are caused to flow severally in said passages from end to end.

5. A hollow water-cooled frame for a furnace doorway and skew-back channel comprising a water-cooling hollow body portion forming the top of the frame, two hollow legs internally communicating with said body portion and depending therefrom in laterally spaced relation to form the sides of the frame, a hollow lintel integral with and horizontally offset from said body portion adjacent the bottom thereof for projection into the furnace doorway immediately below the skew-back channel, two spaced parallel partitions of inverted U-shape as seen edgewise dividing the interior of said lintel into two passages and a compartment extending in side-byside relation lengthwise of the lintel, said compartment extending adjacent to said hollow body and standing in open communication with the interior thereof, an inlet for each passage arranged to deliver to one end thereof a stream of cooling water, and an outlet duct for each passage arranged to receive the stream of cooling water from the other end of the passage, whereby two parallel independently supplied streams of cooling water are caused to flow severally in said passages from end to end.

6. A hollow water-cooled frame for a furnace doorway and skew-back channel comprising a water-containing hollow body portion forming the top of the frame, two hollow legs internally communicating with said body portion and depending therefrom in laterally spaced relation to form the sides of the frame, a hollow lintel integral with and horizontally ofiset from said body portion adjacent the bottom thereof for projection into the furnace doorway immediately below the skew-back channel, a partition of inverted U-shape as seen edgewise dividing the interior of said lintel into two passages extending in sideby-side contact lengthwise of the lintel, an inlet for each passage arranged to deliver to one end thereof a stream of cooling water, and an outlet duct for each passage arranged to receive the stream of cooling water from the other end of the passage, whereby two parallel independently supplied streams of cooling water are caused to flow severally in said passages from end to end, said outlet ducts being arranged to deliver their streams of water one to the bottom ofeach of said hollow legs, and a main water outlet duct opening from said hollow body.

'7. A hollow Water-cooled frame for a furnace doorway and skew-back channel comprising a water-cooling hollow body portion forming the top of the frame, two hollow legs internally communicating with said body portion and depending therefrom in laterally spaced relation to form the sides of the frame, a hollow lintel integral with and horizontally offset from said body portion adjacent the bottom thereof for projection into the furnace doorway immediately below the skew-back channel, two spaced parallel partitions of inverted U-shape as seen edgewise dividing the interior of said lintel into two passages and a compartment extending in side-byside relation lengthwise of the lintel, said compartment extending adjacent to said hollow body and standing in open communication with the interior thereof, an inlet for each passage arranged to deliver to one end thereof a stream of cooling water, and an outlet duct for each passage arranged to receive the stream of cooling water from the other end of the passage, whereby two parallel independently supplied streams of cooling water are caused to flow severally in said passages from end to end, said outlet ducts being arranged to deliver their streams of water one to the bottom of each of said hollow legs, and a main water outlet duct opening from said hollow body.

OTTWlN L. BRAUN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,915,398 Bedell et a1 June 27, 1933 2,107,185 MoAfoos Feb. 1, 1938 2,246,403 McDonnell June 17, 1941 2,427,547 Bulmer Sept. 16, 1947 

